Pressure grease gun



Feb. 28, "1933.

E.- BINORMAN PRES SURE GREASE GUN `AFiled, sept. 15

Jwue'nloc E. Norman dum bis Fb. 28, 1933i E. B. NORMAN `1,899,349

PRESSURE GREASE GUN` sued sept. 151;.1930 2 sheets-sheet 2 Y 3ra/vento@ E. B.2Norman 7 UNITED STA ORLEANS, LOUISIANA, AssIeNoN'ronELIANcE MACHINE L ERNEST n. NORMAN-or NEW y y y Vor! NEW ORLEANS, LOUISIANA, A conronA'rIoN or 215 adapted to engage Patented Feb 28,` 1933 f AND STAMPING WORKS, LOUISIANA Tes; 13A-remi" f OFFICE.

PRESSURE'GREASE GUN l Application led September 15,v 1930. f n Serial No. 482,017.' f

This invention relates to pressure greasey guns `of that type in which asocketed end of the grease gun is adapted to `fit over and beV coupledy to a cylindrical nipple, having pins extending `from' its .sides and 1 cooperating with under-shelving portions of the socketed end, to pull ing contact with the end of thenipple whentightening movement isimparted to the sock- :lo eted end.

' `The invention contemplates the provision of a pressure grease gun havinga two-part socket'ed end or coupling,V one part bearing against the end of the nipple and the otherr the underside of the pins, the two parts being threaded together so that when the parts are relatively rotated in tightening direction,` the one part presses up against the under-side of the pins, drawing the other part `downflmly against the end of the nipple. l To ensure that both parts yof :the socketed end shall not rotate together when it is attempted to impart relative rotation to said parts, the inner part, that is to say, the part which is integral with the gun barrel andk which makes sealing contact with the nipple end, isformed with slots fitting vdown over the pins, and since the outer part has the under-v shelving ledge bearing up against vthe pins,

ity is necessary that this ledge have slots to permit the'pinsto pass into the socketed end of the grease gun. c *A I It is ob v'ous that the slots in the two parts 35 ofthe Sockeied endmust be in-alignment when the gun is applied to the nipple, to permit passage of the pins'and that the same slots must be in alignment when thegrease Ofun isto be removed from the nipple,

` n One of the objects of the present'invention therefore, is to provide a stop on one of they threaded parts of' the socketed end, and an abuttment on the other-part, saidpin engaging said abuttinent when the two parts are positioned with their slots in alignment.

Another object 0f the invention is to provide the inner part with a plurality of slots so that the angular position'of the inner part with respect tothe nipple'may be varied so as to obtain through the threadedconnection a between. said parts. the distancebetween the latter forcibly intoy seall vide for a selective shift-ing of the stopfcorproceeds.

,5-5 of Figure 2;

an initial adjustment of end whichy engages the end of the nipple and the ledge 'which engages the underside yof ,the pin'sto compensate for wear in the gun itself or ofthe'pin which ,the gun engages. 'i f A further object of theinventionis to proresponding tothe change in the angular position of the inner part of the socketed end,`so

the face of thesocketed that the proper slots of the inner part are always in alignment with the slots in the outerA part when the gun is to be positioned upon ory withdrawn'fromthe nipple; f .c

Still another objectof he inventionfisto provide a stop which shall at the same time be the means for inseparably` .connecting the relatively movable parts of the socket portiony ofthe grease gun.

Another'object of the invention relates to the plunger operating mechanism and proc poses means for limiting the dropof the pawl ring when the plunger unit has been removed from the barrel so that the ring alwaysy re- `mains in encompassing-relation tosaid plunger.l 1 f Other objects of thefinvention Will' appear as the following description lofk a preferred andfpractical embodiment thereof In the drawings acters of reference out the several figures parts: l

Figure 1 isA aside elevation of my f improved pressure grease gun;

Figure l section showing have been used throughto designate indentical 2 is a longitudi a the relation of the socketed end to a nipple r yFigure 3 is a section taken` along the line Figure ltis a section taken along the line 4-4 of Figure 2; i f

Figure 5 is a sectimk taken alongthe line an Figure 6 is a modified form of the invention in whichthe barrel of the `gunc'is formed as an elbow.

Referring now in detail` to the several figures and first adverting tothe genera-l assembly shown in Figure 1, the numeral y'1 in which the same chary represents the barrel of the grease gun which is integral with the inner socket member 2. A plunger 3 operates in the barrel and the grease which this particularl gun is designed to eXtrude is of hard consistency, being furnished in the form of candles which are inserted into the top of the barrel after the plunger and its appurtenant operating mechanism has been removed. It will be obvious after the entire description hasbcen unfolded that the'inventive principle is not necessarily coniined to the type of gun illustrated but that it is of general application to other forms of grease gun.

A handle 4 is pivoted to the plunger at 5, the handle extending beyond. the pivotal connection 5 and being pivotally connected at 6 to a link 7 which in turn is pivotally connected at 8 to a pawl ring 9. The pawl ring may be detained in any one of three positions by means of a detentl() which operates within notches 11 and 12 and against the shoulder 13. The lowermost of these three positions is indicated in full lines and isrthe position in which the pawl ring is made to assume when the plunger is in its working phase. The upper broken line position of the pawl ring is that to which it is moved when the plunger is being retracted step by step while the middle, position, also shown in broken lines, is that inwhich the pawl ring is inactive with regard to the barrel 1, in which position the plunger with its operating mechanism may be bodily withdrawn from the barrel for the purpose of introducing a fresh stick of grease. lVhen the pawl ring is in the full line working'position, it'ratchets against the shoulders formed by the corrugations 14 `on the gun barrel, said pawl ring acting as a fulcrum for the power applied to the handle 4 so that the plunger 3 is forced .into the barrel with great leverage. When the pawl ring is moved to its oppositely inclined position it ratchets oppositely against the corrugations 14, the plunger being Withdrawn step by step. Y

This construction is covered in the pending application of E. A. Dunlap Serial No. 47 2,- 953, filed August 4, 1930, and the present improvement involves the additional shoulder or stop 15 which eventually comes into contact with the detent, but only when the plunger together with its operating mechanism has been remove dentirely ,from the gun barrel. It will be noted from Figure 1 that the end of the plunger 3 is so positioned relative to the ring pawl that if the stop 15 were not present the ring pawl would fall beyond the end of the plunger necessitating that the plunger be again introduced into said ring pawl before the plunger is reinserted into the barrel. The stop 15 obviates this inconvenience by catching the ring pawl before it can descend far enough to go beyond the lower end of the plunger.

Referring to Figure 2 it will be observed that the pressure grease gun is used in connection with a nipple 16 having a plane face 17 and a pin 18 extending from said nipple on both sides. It will also be observed that the lower end of the grease gun barrel is formed with an enlargement 19 forming the inner part of the socketed end and being provided atfits outer edge with a plurality of diametrically arranged pairs of slots, any opposite two of which slots may be slipped over the extendingends of the pin 18 so as to prevent the grease gun barrel rotating with respect to the nipple. Figure 2 shows that the inner part 19 of the socketed end is externally threaded and that an outer part 20 is provided, threading on the inner part and being provided with a handle 21 by which it may be turnedv in either direction. The outer part 20 has a ledge 22 extending beneath the ends of the pin 18 and in order for the pin to get into the channel formed between the inner and outer parts of theV socketed ends, the ledge22 is slotted as shown at 23 in Figure 4. When the inner and outer parts are so arranged that a pair of slots of the inner part are in registry with the slots of the outer part, the socketed end can be slipped over thepin 18 and down upon the nipple until the shoulder 20 engages the plane face 17 of the nipple. When the parts are in this position, the under-shelving ledge 22 is in a plane slightly below the lower surface of the pin 18 so that when the handle 21 is operated rotating the outer part 207 the slots in said outer part through which the pins travel when the device was placed upon the nipple, moves out of alignment with the pins and the ledge 22 comes beneath said pins and moves up into tight relation with said pins due to the screwing up of the part 20 upon the part 19. The pressure of the ledge against the under-side of the pin draws the shoulder 20 down to close sealing contact with the plane face of the nipple.

In Vorder to ensure that the slots in the outer part and a pair of slots of the inner part are in alignment at the time of introducing or withdrawing the grease gun relatively to the nipple, a portion of the periphery of the outer part is cut away at the top as indicated at 24 in Figure 3, leaving an abrupt shoulder 25. A pin 26 is screwed or otherwise fixed relatively to the inner part, said pin being in the path of the shoulder 25 and being so related to a pair of slots at the bottom of the inner part that when the outer part has been rotated until the shoulder 25 comes into contact with the pin 26, the position of the parts is such that the pair of slots of the inner member engaging the pin 18 are in alignment with the pair of slots in the outer member. Consequently, before applying the grease gun to the nipple or before removing it, it is merely necessary to grasp the barrel and to turn the outer part of the socketed end by means of the handle 21 until the pin 26 and the shoulder 25 are in contact.

The cutting away of the upper edge of the outer member to form the depression 24, also forms a shoulder 27 on the opposite side of the pin 26 to that of the shoulder 25 so that in tightening the coupling, the shoulder 27` approaches the pin 26. If the grease gun is somewhat worn, .or'ifthe lower sides of the pin 18 are much worn from use,- it may be that the shoulder 27 may strike the pin 26 before tight engagementl of the gun withl the nipple has been eiected. It therefore, becomes essential to provide greater arcuate space be'V tween the shoulder 27 and pin 26 and this is accomplished by providing a circumferential series of sockets, threaded or otherwise furnished with pin retainingmeans, into which sockets the pin maybe successively transferred according tothe degree of wear-and the amplitude of the relative rotation'of the parts necessary for the proper tightening kof the grease gun. If uponattempting to tighten the coupling engagement of the grease gun f with the nipple, the shoulder 27 abutts the i pin 26 before a tight connectionhas been et` fected, the pin 26 is transferred to the next socket in a clockwise direction, that 1s to say,

the socket 28. The outer part may then bey rotated through an additional arc equal to the angle between the pin 26 and the shoulder 27 within which arc the tight relation of thek l the two parts of the socketed end of the' grease gun in unitary relation, preventing loss of the outer part together with'thehandie. 1

The operation of the invention has been described step by step as the description proceeded so that it is unnecessary to repeat the statement of operation at this point other than to emphasize'the fact that the pressure of the ledge 22 upwardly against the Vunderside oi' the pin 18, draws the shoulder 20 down into firm, sealing Contact with thfel lplane surface of the nipple so as to prevent any extrusion of grease into the socket, while the fact that there is total absence of rotation between the shoulder 20 and the coact-` ing end of the nipple prevents wear of these part-s and ensures'a long life both to the nipple and the gun.

The wear takes place solely at the upper tion is to be measured the ledge 22 is from time to time presented to the pin 18, so that the wear on the ledge 22 is minimized. Wear of the pin 18 is usually cured .by replacing the entire nipple, although in an emergency the pin can be driven out andy turned so as to present a fresh surface at its under-side. i

In Figure 6 a form of the invention is shown in which the barrel 1 is formed with an elbow 30 so that the operation of the plunger is at right angles to the axis of the socketed end. I

In other respects, this form of the invention is similar to that which above has been described in detail. j

While IL have in the above invention en-f deavored to describe what I believe to be a preferred and practical form of my invention, it-is to be understood that the details of construction as shown are merelyby `way of example and may be" substituted by their equivalents and that the scope of the invenby the extensiveness of the appended claims. f

Vhat I claim is: y s

1. Coupling for attaching agrease gun to a nipple of that typeqcomprising a cylindrical body with atlat end normal to the axis of said body, with'a grease conduit opening into said flat end, and with lateral projections below said flat end, said coupling comprising Yan inner member having an axial bore, yformed as a socket with` a peripheral flange and an internal shoulder surrounding said bore, the edge of said ange being provided with a series of indents for selectively receiving the lateral projections, an outer member screwing on said inner member and having an inwardly directed ledge at its free end extending overl the ends of said indents, the latter being suiiciently deep to be out of contact at their bottoms with said projections when said ledge contacts with the flat end of said nipple, the side of said ledge adjacent the ends of said indents lying in a planeperpendicular to the axis of rotation of said outer member, and having projectionadmitting channels breaking its continuity and registrable selectively with said indents.

,f 2. Coupling as claimed in claim 1, including co-acting means on said inner and outer members acting as a stop to aline said channels with certain'of said indents, one of said co-acting members being adjustable to determine the selection of the indents into which said projections shall be introduced.

In testimony whereof I aix my signature.

l ERNEST B. NORMAN.

surface of the ledge 22 and on the lower side ofthe pin 18. By virtue of ythe adjusting feature above described,`ia fresh portion ofl 

